Q11 of 16 Page 343

No one can sink in the Dead Sea. Do you agree? Give reason.

No one can sink in the Dead Sea is a misconception. The Dead Sea is highly saline that is salt content is very high. Due to the high salt content, the water of Dead Sea is denser than the freshwater. So objects which are denser than the salty water will sink while those which are not will float.


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9

A body lying on a mattress stands up on it. He observes that the mattress is now depressed deeper down. Why does this happen?

 10

The relative density of silver is 10.8. The density of water is 103kgm–3. What is the density of silver is SI units?

 12

A hollow plastic ball is taken to the bottom of a through of water and released there (see adjoining figure).


(a) What happens to the ball?


(b) Give a reason for this phenomenon.

 13

A wooden block is kept on a table top. The mass of the wooden block is 5 kg and its dimensions are 40 cm × 20 cm × 10 cm. Find the pressure exerted by the wooden block on the table top if it is made to lie on the table top with its sides of dimensions (a) 20 cm × 10 cm and (b) 40 cm × 20 cm.